The checkmate was so easy and straightforward. In a game, if I was focused on my attack, I would have seen it right away. Bur if I was focused on defense, I might have played 1.b3 and missed the easy checkmate sequence. Note that 1.b3 is also aggressive, black would probably move his queen to safety, and I might then see my Rh8 - Qh5 - Qh2# sequence. I would be especially likely to focus on my best move with my h-file rook if black answered 1.b3 with ... Qe2 (threatening 2....Bxf3 and 3....Bxh1.

But today the solution jumped right out at me, and that was before I ever saw the Mate in 3 title.